Good news, Sarah! Pandora likes you!
Wait, is that good news?
I'm certain one can find examples of Sarah not reacting to paranormal things with curiosity and/or sass, but time has passed since the start of the comic. It's entirely possible Sarah's sass-levels (and time spent around weird stuff) have increased since then.
That, and you never tell the scary floating girl about the third "freak out in terror" option. You don't want them knowing that's on the table.